I am often asked if a particular stadium has a "hot gun". The following is a list of corrections/offsets that we use in our data.

These #s use a rolling average of 10 games on either side; so, they are not yet nearly as precise at the very start of the season. Additionally, we use 55' (rather than the gameday standard 50') to compute velo, because it is a more accurate reflection of where the pitcher releases the ball.

For the following table, a negative mph number indicates a cool gun and a positive number indicates a hot gun.

You can also see that several stadiums have relatively large positive values for pfx_x, which indicates that movement is shifted right from the catcher's POV (or left, or negative numbers). Again, these are corrected out of the data displayed on the site.

Because these values change, these values reflect the current corrections applied on 09/19/2014. We also keep historical records on each game's offset for use on our cards and data system.
For more information, please contact dan@brooksbaseball.net

homemphpfx_xpfx_zx0z0axayazvx0vy0vz0
ana 0.318 -0.754 0.751 0.002 -0.057 -1.272 1.688 1.293 0.485 -0.453 -0.302
ari -0.047 0.022 0.305 0.107 -0.05 0.01 -0.657 0.532 -0.202 0.077 -0.528
atl -0.412 0.087 -0.08 -0.136 -0.017 0.289 -1.884 -0.179 0.283 0.606 0.202
bal -0.294 0.212 0.155 0.266 0.164 0.392 -0.593 0.212 -0.658 0.42 -0.325
bos 0.059 1.314 0.821 0.128 -0.115 2.204 0.357 1.39 -0.632 -0.102 -0.229
cha 0.184 -1.046 0.28 -0.057 -0.024 -1.8 1.644 0.375 0.721 -0.264 -0.132
chn -0.451 -1.122 0.437 -0.158 -0.014 -1.819 -1.14 0.642 0.709 0.673 -0.087
cin -0.044 0.564 -0.107 -0.169 0.041 0.96 -1.627 -0.187 0.433 0.07 -0.167
cle -0.207 0.313 -0.262 -0.093 0.062 0.596 -1.992 -0.437 -0.114 0.288 -0.087
col 0.25 1.476 -1.46 0.124 -0.114 2.601 -2.685 -2.476 -0.75 -0.415 0.656
det -0.196 -0.589 0.231 -0.102 -0.081 -1.019 -1.689 0.4 0.545 0.285 -0.221
flo -0.101 0.889 -0.145 -0.006 -0.152 1.526 -0.091 -0.195 -0.318 0.142 0.313
hou 0.247 2.055 0.391 0.126 -0.074 3.471 3.553 0.598 -1.028 -0.394 -0.001
kca -0.332 -1.181 0.654 0.27 -0.126 -1.971 -0.887 1.026 -0.173 0.474 -0.132
lan 0.685 -0.749 0.386 0.17 -0.111 -1.392 0.577 0.724 0.163 -1.004 -0.028
mia -0.677 0.029 0.705 0.195 0.047 0.073 0.66 0.992 -0.44 0.99 -0.342
mil 0.11 -0.69 -0.185 0.075 0.002 -1.122 0.032 -0.381 0.244 -0.149 -0.05
min -0.782 0.998 -0.104 0.076 0.083 1.796 -1.426 -0.408 -0.528 1.138 -0.095
nya 0.161 -0.036 1.011 -0.029 -0.053 -0.066 -0.133 1.834 -0.221 -0.234 -0.493
nyn -0.258 0.453 -0.618 -0.232 0.028 0.844 1.661 -1.224 0.39 0.375 0.067
oak -0.604 0.677 -0.481 0.061 -0.012 1.107 -2.227 -0.854 -0.502 0.87 0.088
phi -0.088 -1.629 0.476 0.005 0.077 -2.706 1.665 0.755 0.399 0.149 -0.471
pit -0.392 0.817 -0.617 -0.047 -0.124 1.402 -0.53 -1.19 -0.073 0.55 0.578
sdn 0.395 1.464 -0.002 0.215 -0.09 2.561 0.457 0.07 -1.351 -0.603 0.073
sea 0.319 -0.212 -4.096 0.069 -0.309 -0.316 2.19 -6.869 -0.267 -0.527 2.103
sfn 0.347 -0.132 -0.189 -0.012 0.053 -0.175 -0.98 -0.232 0.001 -0.514 -0.29
sln -0.269 -1.681 -0.316 -0.158 -0.01 -2.897 0.908 -0.733 0.695 0.389 0.109
tba -0.317 2.639 0.594 0.097 -0.06 4.488 1.289 0.841 -1 0.427 0.009
tex -0.498 -0.046 0.857 -0.09 0.155 -0.081 -2.607 1.429 0.035 0.737 -0.53
tor 0.555 -0.736 -0.481 0.068 -0.112 -1.243 1.53 -0.783 -0.018 -0.842 0.448
was 0.322 -1.023 -0.038 0.065 -0.123 -1.717 1.249 -0.091 0.252 -0.45 -0.065